A.3-4B.2-4C.2-3D.2-5
A.錯開、連續(xù)縫B.連續(xù)縫,錯開C.錯開,錯開D.連續(xù)縫,連續(xù)縫
A.錯開,連續(xù)縫B.連續(xù)縫,錯開C.錯開,錯開D.連續(xù)縫,連續(xù)縫